4x4 will not work only the front wheels pull and not the back
4x4 will not work only the front wheels pull and not the back 4x4 light blinks on 2005 Mercury Mariner
The 4X4 light flashing indicates a fault in the transfer case system. The concern could be electronic or mechanical. We do not see many problems with this system. It takes a scanner that can access the 4X4 module to pull DTC's. Without these codes, it would be impossible to diagnose.